Kaguya is a collector of magic garments (a type of magic treasure), and is a self-proclaimed resident of the moon. She was found by an elderly couple, who raised and indulged her very much. She’s participating in the tournament because she’s interested in the "Queen’s Blade" the winner is said to obtain. Although she’s made an earnest supply of treasure from many people due to her cute appearance, she isn’t a wicked, calculating woman, she’s simply childlike, with a low mental age. 